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**Measuring Volume with the Metric System**

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**What about volume? How do we choose the correct unit to measure volume?**

There are two metric units for measuring volume or capacity, milliliters and liters. This comparison may seem a little more obvious that the units for mass. A milliliter would be used to measure very small amounts of liquid. Milliliters are much smaller even than ounces. A liter would be used to measure much larger volumes of liquid.

A milliliter is \begin{align*}\frac{1}{1000}\end{align*} of a liter.

**Would you measure a bottle of soda in liters or milliliters?**

You would measure it in liters. A 2 liter bottle of soda is a standard size for soda bottles. Think about milliliters as the amount of liquid in an eyedropper.

**Use what you have learned to select the correct metric unit for each item.**

#### Example A

The weight of five pennies

**Solution: Grams**

#### Example B

The amount of water in a bathtub.

**Solution: Liters**

#### Example C

The weight of a car

**Solution: Kilograms**

Vocabulary

Here are the vocabulary words in this Concept.

- Customary System
- The system of measurement common in the United States, uses feet, inches, pounds, cups, gallons, etc.

- Volume
- the amount of liquid an object or item can hold

- Mass
- the weight of an object

### Video Review

Here are videos for review.

Khan Academy Conversion Between Metric Units

James Sousa Metric Unit Conversions

### Practice

Directions: Choose the best unit of either length, mass or volume to measure each item.

1. A dictionary

2. A flea under a microscope

3. A jug of apple cider

4. An almond

5. Drops of water from an eyedropper

6. Ten dimes

7. Diameter of a dime

8. A bucket of water

9. A baby bottle

10. A handful of rice

11. A large jug of water

12. A water tower

13. The water in a swimming pool

14. Distance across a swimming pool

15. The weight of a boat

16. A handful of sand

17. The weight of a backpack